# 
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
# 
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
# 
# The Original Code is the RDF::Core module
# 
# The Initial Developer of the Original Code is Ginger Alliance Ltd.
# Portions created by Ginger Alliance are 
# Copyright (C) 2001 Ginger Alliance Ltd.
# All Rights Reserved.
# 
# Contributor(s):
# 
# Alternatively, the contents of this file may be used under the
# terms of the GNU General Public License Version 2 or later (the
# "GPL"), in which case the provisions of the GPL are applicable 
# instead of those above.  If you wish to allow use of your 
# version of this file only under the terms of the GPL and not to
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package RDF::Core::Enumerator::Memory;

use strict;
require Exporter;

our $VERSION = '0.02';
our @ISA = qw(RDF::Core::Enumerator);

use RDF::Core::Enumerator;
use Carp;

sub new {
    #$data is an array of statements
    my ($pkg,$data)=@_;
    $pkg = ref $pkg || $pkg;
    my $self={};

    $self->{_data}=$data;
    $self->{_position} = -1;
    bless $self,$pkg;
}
sub getFirst {
    my $self = shift;
    $self->{_position} = -1;
    return $self->getNext
}
sub getNext {
    my $self = shift;
    $self->{_position} += 1;
    return $self->{_data}->[$self->{_position}];
}
sub close {
    $_[0]->{_data} = undef;
}

1;
__END__


=head1 NAME

RDF::Core::Enumerator::Memory - Enumerator in memory

=head1 DESCRIPTION

Enumerator is a set of statements retrieved from a model.
When Memory enumerator is created, it makes in-memory copy of all data it helds, so it's independent on adding / removing statements.

=head2 Interface

=over 4

=item * new(\@data)

@data is an array of RDF::Core::Statement objects.

=back

The rest of the interface is described in RDF::Core::Enumerator.

=head1 LICENSE

This package is subject to the MPL (or the GPL alternatively).

=head1 AUTHOR

Ginger Alliance, rdf@gingerall.cz

=head1 SEE ALSO

  RDF::Core::Enumerator, RDF::Core::Model, RDF::Core::Storage

=cut
